{DESCRIPTION}
{Title of Invention}
SHIP EQUIPPED WITH LIQUEFIED GAS VAPORIZATION DEVICE, AND
LIQUEFIED GAS VAPORIZATION DEVICE
{Technical Field}
{0001}
The present invention relates to a ship equipped with a
liquefied-gas vaporizer that vaporizes liquefied gas and to a
liquefied-gas vaporizer.
{Background Art}
{0002}
Patent Literature 1 discloses a general Open-Rack-type
liquefied-gas vaporizer (ORV; Open-Rack-type Vaporizer) in the
related art. As shown in Fig. 6(A), this liquefied-gas
vaporizer 101 is provided with a plurality of heat exchange
panels 6 in which numerous heat transfer pipes 5, extending in
the vertical direction, are arranged in parallel between
bottom-portion header pipes 3 and top-portion header pipes 4
that are disposed horizontally and parallel to each other with
a distance of, in the vertical direction, several meters
therebetween. Troughs (weirs) 7 are disposed at both sides of
the top portions of the individual heat exchange panels 6 in
close proximity thereto. The troughs 7 make heating-medium
fluid W (generally, seawater) supplied from a water supply
nozzle 8 to overflow so as to flow over the heat exchange
2
panels 6. At the interiors of the heat exchange panels 6,
low-temperature liquefied gas (LNG, LPG, or the like) supplied
to the bottom-portion header pipes 3 is gasified by undergoing
heat exchange with the heating-medium fluid W applied onto the
exteriors of the heat transfer pipes 5 while flowing upward in
the interiors of the heat transfer pipes 5, is made to flow
into the top-portion header pipes 4 in the form of roomtemperature
gaseous gas, and is supplied to required portions
such as a city gas line, a power generation facility, and so
forth.
{Citation List}
{Patent Literature}
{0003}
{PTL 1} Japanese Unexamined Patent Application, Publication
No. 2011-112294
{Summary of Invention}
{Technical Problem}
{0004}
In the case in which the above-described Open-Rack-type
liquefied-gas vaporizer is installed in locations where
rolling and tilt occur due to waves and wind, such as on
liquefied-gas transport ships (LNG ships) or offshore floating
units, including FSRUs (Floating Storage and Regasification
Units) and FPSOs (Floating Production, Storage and
Offloadings), because the entire liquefied-gas vaporizer 101
3
tilts as shown in Fig. 6(B), it is not possible to make the
heating-medium fluid W evenly overflow from both sides of the
troughs 7. Because of this, the heating-medium fluid W is
made to flow only on one surface of the heat exchange panels 6
(heat transfer pipes 5), and there is a risk of not only
failing to achieve a predetermined vaporizing performance but
also resulting in damage to the heat exchange panels 6 due to
the occurrence of thermal strain localization. Therefore, at
locations where rolling occurs, like on ships and offshore
floating units, it has not been possible to employ the Open-
Rack-type liquefied-gas vaporizers, and there has been no
other choice but to employ cascading-type or water (involving
steam as its vapor)-heating-type liquefied-gas vaporizers,
which are more complicated and inferior in terms of
operability and maintainability.
{0005}
The present invention is made in light of the abovedescribed
circumstances, and an object thereof is to make it
possible to install an Open-Rack-type liquefied-gas vaporizer
having a simple configuration and high operability at a
location where rolling and tilt occur, such as on a ship or an
offshore floating unit.
{Solution to Problem}
{0006}
In order to achieve the above-described object, the
4
present invention employs the following solutions.
A ship equipped with a liquetied-gas vaporizer, the
liquetied-gas vaporizer comprising: a heat exchange panel that
gasifies liquefied gas at an interior thereof by means of heat
exchange; and a trough disposed adjacent to the heat exchange
panel, wherein the liquefied gas is subjected to the heat
exchange by making a heating-medium fluid overflow from an
overflow opening of the trough and by making the heatingmedium
fluid flow on a surface of the heat exchange panel, and
wherein the liquetied-gas vaporizer has a configuration in
which a vertical height of an edge portion of the trough that
does not face the heat exchange panel is set so as to be
greater than a vertical height of an edge portion of the
trough that faces the heat exchange panel.
{0007}
With a ship equipped with the liquetied-gas vaporizer
having the above-described configuration, even if the hull is
tilted and the entire liquetied-gas vaporizer is tilted toward
the trough when viewed from the heat exchange panel, until the
tilt angle thereof reaches a tilt angle at which the vertical
height of the edge portion, which is a part of the overflow
opening of the trough and faces the heat exchange panel,
matches the vertical height of the edge portion that does not
face the heat exchange panel, it is possible to continue to
apply the heating-medium fluid onto the heat exchange panel
5
from the trough, and thus, it is possible to achieve good
gasification of the liquefied gas.
{0008}
By doing so, so long as the rolling angle is within a
predetermined range, liquefied gas can be gasified by means of
an Open-Rack-type liquefied-gas vaporizer having a simple
configuration and high operability even when the hull rolls
due to waves and wind. Therefore, as compared with the case
in which a cascading-type or a water (involving steam as its
vapor)-heating-type liquefied-gas vaporizer, which has
conventionally been employed for offshore use, is installed,
it is possible to considerably lower the cost of the ship.
{0009}
In addition, a liquefied-gas vaporizer according to the
present invention includes a heat exchange panel that gasifies
liquefied gas at an interior thereof by means of heat
exchange; and a trough disposed adjacent to the heat exchange
panel, wherein the liquefied gas is subjected to the heat
exchange by making a heating-medium fluid overflow from an
overflow opening of the trough and by making the heatingmedium
fluid flow on a surface of the heat exchange panel, and
wherein the liquefied-gas vaporizer has a configuration in
which a vertical height from a bottom plate to an edge portion
of the trough that does not face the heat exchange panel is
set so as to be greater than a vertical height from the bottom
6
plate to an edge portion of the trough that faces the heat
exchange panel.
{0010}
With the liquefied-gas vaporizer having the abovedescribed
configuration, even if the entire liquefied-gas
vaporizer is tilted toward the trough when viewed from the
heat exchange panel, until the tilt angle thereof reaches a
tilt angle at which the vertical height of the edge portion,
which is a part of the overflow opening of the trough and
faces the heat exchange panel, matches the vertical height of
the edge portion that does not face the heat exchange panel,
it is possible to continue to apply the heating-medium fluid
onto the heat exchange panel from the trough, and thus, it is
possible to achieve good gasification of the liquefied gas.
{0011}
By doing so, even if the liquefied-gas vaporizer is
installed in a location where rolling occurs due to waves and
wind, such as on a ship or an offshore floating unit, the
liquefied-gas vaporizer can be operated so long as the rolling
angle thereof is within the predetermined range. Therefore,
it is possible to install an Open-Rack-type liquefied-gas
vaporizer having a simple configuration and high operability
at a location where rolling occurs, such as on a ship or an
offshore floating unit.
{0012}
7
In the liquefied-gas vaporizer having the above-described
configuration, when a horizontal distance between the edge
portion that faces the heat exchange panel and the edge
portion that does not face the heat exchange panel is C, when
a maximum tilt angle of the liquefied-gas vaporizer in the indirection
is 9, when a distance from the bottom plate to the
edge portion that faces the heat exchange panel is LI, and
when a distance from the bottom plate to the edge portion that
does not face the heat exchange panel is L2, LI and L2 are set
so that the following expression is achieved: L2 - LI > C'tan
9.
{0013}
By doing so, by appropriately setting a difference
between the distance from the bottom plate of the trough to
the edge portion that faces the heat exchange panel and the
distance from the bottom plate of the trough to the edge
portion that does not face the heat exchange panel in
accordance with tilt angles expected for the liquefied-gas
vaporizer, it is possible to supply the heating-medium fluid
to the heat exchange panel from the trough even if the
liquefied-gas vaporizer is maximally tilted, and thus, it is
possible to install an Open-Rack-type liquefied-gas vaporizer
in a location where tilt and rolling occur.
{0014}
In the liquefied-gas vaporizer having the above-described
8
configuration, it is preferable that an interior of the trough
is partitioned into a plurality of water supply sections that
are horizontally arranged in a longitudinal direction of the
trough, the liquetied-gas vaporizer further comprising a
distribution water nozzle for evenly distributing the heatingmedium
fluid to the plurality of water supply sections.
{0015}
In the case in which such a configuration is employed,
even if the liquetied-gas vaporizer rolls, making the heights
at the two ends of the trough different, the heating-medium
fluid stored at the interior of the trough is prevented from
being entirely collected at one end of the trough. Because of
this, the heating-medium fluid is uniformly distributed over
the entire width (entire surface) of the heat exchange panel
from the individual water supply sections, and thus, it is
possible to achieve good gasification of the liquefied gas at
the interior of the heat exchange panel.
{0016}
In the liquetied-gas vaporizer having the above-described
configuration, it is preferable that the distribution water
nozzle has a pipe-shape that passes through the plurality of
water supply sections so as to extend in the longitudinal
direction of the trough, and that has water supply ports that
respectively open at interiors of the individual water supply
sections.
9
{0017}
In the liquefied-gas vaporizer having the above-described
configuration, the two overflow openings for individually
making the heating-medium fluid flow on each of the heat
exchange panels that face each other, are disposed adjacent to
each other in the trough installed between the two heat
exchange panels that face each other, a partitioning plate
that partitions the two overflow openings is provided, and a
top edge portion of the partitioning plate is the edge portion
that does not face the heat exchange panel and that is shared
by the two overflow openings.
{0018}
In the case in which such a configuration is employed, in
the trough installed between the two heat exchange panels that
face each other, the top end portion of the partitioning plate
that partitions the two overflow openings that are disposed
adjacent to each other is the edge portion that does not face
the heat exchange panel and that is shared by the overflow
openings. Because of this, it is possible to make the
heating-medium fluid evenly flow over the two heat exchange
panels that face each other by providing the two overflow
openings, while keeping the structure of the trough simple.
{Advantageous Effects of Invention}
{0019}
As described above, a ship equipped with a liquefied-gas
10
vaporizer according to the present invention is equipped with
an inexpensive Open-Rack-type liquefied-gas vaporizer that can
be installed in a location where rolling and tilt occur.
Accordingly, as compared with a case in which a ship is
equipped with an offshore liquefied-gas vaporizer in the
related art, it is possible to considerably decrease the cost
of the ship, and it is also possible to enhance the
operability and maintainability of the liquefied-gas
vaporizer.
{0020}
In addition, with the liquefied-gas vaporizer according
to the present invention, it is possible to install an Open-
Rack-type liquefied-gas vaporizer having a simple
configuration and high operability and maintainability in a
location where rolling and tilt occur, such as on a ship and
an offshore floating unit, thereby increasing the
applicability thereof.
{Brief Description of Drawings}
{0021}
{Fig. 1} Fig. 1 is a longitudinal sectional view of a
liquefied-gas vaporizer according to an embodiment of the
present invention.
{Fig. 2} Fig. 2 is a diagram showing an enlarged view of
troughs in Fig. 1, where Fig. 2(A) shows troughs on both outer
sides of heat exchange panels, and Fig. 2(B) shows troughs
11
that are positioned between the heat exchange panels.
{Fig. 3} Fig. 3 is a longitudinal sectional view along the
longitudinal direction of the trough, taken along line III-III
in Fig. 1.
{Fig. 4} Fig. 4 is a longitudinal sectional view showing a
state in which the liquefied-gas vaporizer is tilted in a
lateral direction.
{Fig. 5} Fig. 5 is a longitudinal sectional view of the trough
showing a state in which the liquefied-gas vaporizer is tilted
in a longitudinal direction.
{Fig. 6} Fig. 6 is a longitudinal sectional view of a
liquefied-gas vaporizer of the related art (A) when it is not
tilted and (B) when it is tilted.
{Description of Embodiment}
{0022}
An embodiment of the present invention will be described
below with reference to the drawings.
Fig. 1 is a longitudinal sectional view of a liquefiedgas
vaporizer according to an embodiment of the present
invention. This liquefied-gas vaporizer 1 is installed in,
for example, a liquefied-gas transport ship, and is an
apparatus that changes the liquefied gas into gaseous gas by
subjecting it to heat exchange with seawater (heating-medium
fluid). In this liquefied-gas vaporizer 1, bottom-portion
header pipes 3, top-portion header pipes 4, heat transfer
12
pipes 5, and heat exchange panels 6 have the same
configurations as those in the liquetied-gas vaporizer 101 in
the related art shown in Figs. 6(A) and (B). Note that Fig. 1
shows an example in which three heat exchange panels 6 are
provided.
{0023}
Troughs 10A are provided at both outer sides of the three
heat exchange panels 6, and troughs 10B are provided at
positions located between the heat exchange panels 6. As also
shown in Figs. 2(A) and (B) and Fig. 3, the troughs 10A and
10B are formed like weirs (box shapes) that horizontally
extend in the longitudinal direction of the heat exchange
panels 6, and each of which is provided with a bottom plate
11, side plates 12 that face each other so as to be parallel
to the surfaces of the heat exchange panels 6, a partitioning
plate 14, and a pair of end plates 13 that are provided at
both ends of the troughs 10A and 10B in the longitudinal
direction thereof so as to face each other.
As shown in Fig. 2(B), in the trough 10B that is
positioned between two heat exchange panels 6, the vertical
partitioning plate 14 is provided at an intermediate position
between the pair of side plates 12 that face each other.
Because of this, the longitudinal cross-sectional shape of the
trough 10B is shaped like two troughs 10A connected together
back-to-back (protruding pentagon having two vertical
13
longitudinal sides). In addition, in the trough 10A, one side
plate 12 and one partitioning plate 14 face each other.
{0024}
The tops of the troughs 10A and 10B are open and serve as
overflow openings 18. The overflow openings 18 open with a
tilt angle 9 tilting downward toward the adjacent heat
exchange panels 6. In the trough 10B, two overflow openings
18 are arranged adjacent to each other so as to individually
make the seawater W flow over the heat exchange panels 6 on
both sides thereof, and the partitioning plate 14 therebetween
divides the two overflow openings 18.
{0025}
As shown in Figs. 2(A) and (B), the overflow openings 18
of the troughs 10A and 10B have heat-exchange-panel edge
portions 18a positioned closer to the heat exchange panels 6
(edge portions that face the heat exchange panels) and heatexchange-
panel opposite edge portions 18b positioned on the
opposite side away from the heat exchange panels 6 with the
heat-exchange-panel edge portions 18a, the heat-exchange-panel
opposite edge portions 18b are located between the heatexchange-
panel edge portions (edge portions that do not face
the heat exchange panels). The heat-exchange-panel edge
portions 18a are edge portions over which the seawater W flows
toward the exterior when flowing onto the heat exchange panels
6 by overflowing from the overflow openings 18.
14
{0026}
In the trough 10A, the heat-exchange-panel edge portion
18a corresponds to the top edge portion of the side plate 12
that faces the heat exchange panel 6, and the heat-exchangepanel
opposite edge portion 18b corresponds to the top edge
portion of the partitioning plate 14 that does not face the
heat exchange panel 6. In addition, in the trough 10B, the
heat-exchange-panel edge portions 18a correspond to the top
edge portions of the individual side plates 12 at both sides,
and the top edge portion of the partitioning plate 14
corresponds to the heat-exchange-panel opposite edge portion
18b that is shared between the two overflow openings 18.
{0027}
Then, in the troughs 10A and 10B, assuming that the
distance from the bottom plate 11 to the heat-exchange-panel
edge portion 18a of the overflow opening 18 (side plate 12) is
Ll and that the distance from the bottom plate 11 to the heatexchange-
panel opposite edge portion 18b of the overflow
opening 18 (partitioning plate 14) is L2, the heights of the
individual side plates 12 and the partitioning plates 14 are
set so that L2 is greater than Ll.
{0028}
In addition, assuming that the distance between each of
the pair of side plates 12, which are substantiallyperpendicular
to the bottom plate 11, and the partitioning
15
plate 14 is C and that a maximum tilt angle of the entire
liquefied-gas vaporizer 1 (i.e., ship) in the C-direction
(lateral direction) is 9, the heights Ll and L2 are set so
that the expression L2 - Ll > C'tan 9 can be achieved. Because
of this, even if the liquefied-gas vaporizer 1 is tilted to
the maximum tilt angle 9, the length Ll from the bottom plate
11 to the heat-exchange-panel edge portion 18a is kept less
than the length L2 from the bottom plate 11 to the heatexchange-
panel opposite edge portion 18b.
{0029}
On the other hand, as shown in Fig. 3, in the troughs 10A
and 10B, the space between the side plate 12 and the
partitioning plate 14 that face each other or the space
between the side plates 12 that face each other is partitioned
by a plurality of baffle plates 20, thus forming a plurality
of (twelve in this case) water supply sections 21 so as to be
horizontally arranged in the longitudinal direction inside the
troughs 10A and 10B. Note that the height of the baffle
plates 20 is desirably a height that is slightly lower than
the water surface of the seawater W when the troughs 10A and
10B are not tilted. By doing so, the water levels at the
individual water supply sections 21 can be made uniform. In
addition, the space between the baffle plates 20 need not
necessarily be equal.
{0030}
16
Furthermore, a distribution water nozzle 23 that evenly
distributes the seawater W to the plurality of water supply
sections 21 is provided. This distribution water nozzle 23 is
formed in a pipe-shape that passes through the plurality of
water supply sections 21 (baffle plates 20) so as to extend in
the longitudinal direction of the troughs 10A and 10B and has
a plurality of water supply ports 23a that are open at the
interiors of the individual water supply sections 21. A water
supply nozzle 24 is connected, from below, to the distribution
water nozzle 23 at the vicinity of an intermediate portion
thereof, and the seawater W supplied from the water supply
nozzle 24 is distributed to the individual water supply
sections 21 from the individual water supply ports 23a of the
distribution water nozzle 23.
{0031}
The liquefied-gas vaporizer 1 configured as described
above is operated as below.
When the liquefied-gas vaporizer 1 shown in Fig. 1 is not
tilted, the seawater W supplied to the troughs 10A and 10B
from the water supply nozzles 24 via the distribution water
nozzles 23 overflows from the overflow openings 18, thus the
seawater W is made to flow over the heat exchange panels 6.
Because of this, low-temperature liquefied gas supplied to the
bottom-portion header pipes 3 is gasified when flowing upward
inside the heat transfer pipes 5 by undergoing heat exchange
17
with the seawater W, thus flowing to the top-portion header
pipes 4 in the form of room-temperature gaseous gas to be
supplied to required portions located further downstream
therefrom.
{0032}
In addition, as shown in Fig. 4, the distance from the
bottom plate 11 to the heat-exchange-panel opposite edge
portion 18b (L2 in Fig. 2) is set so as to be greater than the
distance from the bottom plate 11 to the overflow opening 18
(LI in Fig. 2) even if the liquefied-gas vaporizer 1 is tilted
in the lateral direction (thickness direction of the heat
exchange panel 6). Because of this, until reaching a tilt
angle at which the length Ll matches the length L2, that is, a
tilt angle that exceeds the maximum tilt angle 9, it is
possible to apply the seawater W onto the heat exchange panels
6 from the troughs 10A and 10B, and thus, it is possible to
achieve good gasification of the liquefied gas.
{0033}
When the liquefied-gas vaporizer 1 is installed in a
ship, in the troughs 10A and 10B, the length (Ll) from the
bottom plate 11 to the heat-exchange-panel edge portion 18a of
the overflow opening 18 and the length (L2) from the bottom
plate 11 to the heat-exchange-panel opposite edge portion 18b
should be set so that, as shown in Fig. 4, a height HA in the
vertical direction from a reference line which extends in the
18
horizontal direction, for example, a water line WL, to the
heat-exchange-panel edge portion 18a is kept lower than a
height HB in the vertical direction from the water line WL to
the heat-exchange-panel opposite edge portion 18b until the
rolling angle of the ship reaches a maximum allowable angle
(for example, 15°).
{0034}
Because of this, even when the liquefied-gas vaporizer 1
is installed in a liquefied-gas transport ship, as described
in this embodiment, or when the liquefied-gas vaporizer 1 is
installed in a location where rolling occurs due to waves and
wind, like on an offshore floating unit, the liquefied-gas
vaporizer 1 can be continued to be kept in operation so long
as the rolling angle of the liquefied-gas vaporizer 1 is
within a predetermined range. Therefore, it is possible to
install an Open-Rack-type liquefied-gas vaporizer 1 having a
simple configuration and high operability at a location where
rolling occurs, such as on a ship or an offshore floating
unit.
{0035}
In addition, LI and L2 are set so that the expression L2
- LI > C-tan 9 can be achieved, assuming that the distance
between the heat-exchange-panel edge portion 18a and the heatexchange-
panel opposite edge portion 18b in plan view is C and
that the maximum tilt angle of the entire liquefied-gas
19
vaporizer 1 in the C-direction is 9. Because of this, even if
the liquefied-gas vaporizer 1 is tilted to the maximum tilt
angle 9, the seawater W can be supplied to the heat exchange
panels 6 from the troughs 10A and 10B.
{0036}
Furthermore, by partitioning the interiors of the troughs
10A and 10B with the plurality of baffle plates 20, the
plurality of water supply sections 21 that are horizontally
arranged in the longitudinal direction thereof are formed, and
the distribution water nozzles 23 that evenly distribute the
seawater W to the plurality of water supply sections 21 are
also provided. Because of this, even if the liquefied-gas
vaporizer 1 rolls in the longitudinal direction, making the
heights at the two ends of the troughs 10A and 10B different,
as shown in Fig. 5, because the seawater W is held at the
interiors of all water supply sections 21, the seawater W in
the troughs 10A and 10B is prevented from entirely being
collected at one end of the troughs 10A and 10B. Because of
this, the seawater W is uniformly distributed over the entire
width (entire surface) of the heat exchange panels 6 from the
individual water supply sections 21, and thus, it is possible
to achieve good gasification of the liquefied gas at the
interiors of the heat exchange panels 6.
{0037}
The distribution water nozzle 23 has a pipe-shape that
20
passes through the plurality of water supply sections 21
(baffle plates 20), extending in the longitudinal direction of
the troughs 10A and 10B, and that has the water supply ports
23a that open at the interiors of the individual water supply
sections 21. Because of this, the seawater W can evenly be
distributed to all water supply sections 21 while keeping the
configuration of the distribution water nozzle 23 simple.
{0038}
In the trough 10B installed between two heat exchange
panels 6 that face each other, the two overflow openings 18
that individually make the seawater W flow over each of the
heat exchange panels 6 that face each other are disposed
adjacent to each other, and the partitioning plate 14 that
partitions these two overflow openings 18 is also provided
therebetween. The top edge portion of the partitioning plate
14 corresponds to the heat-exchange-panel opposite edge
portion 18b that is shared between the two overflow openings
18. Because of this, it is possible to make the seawater W
evenly flow on both of the two heat exchange panels 6 that
face each other by providing the two overflow openings 18,
while keeping the structure of the trough 10B extremely
simple.
{0039}
Thus, by installing the thus-configured liquefied-gas
vaporizer 1 in a liquefied-gas transport ship, so long as the
21
rolling angle is within the predetermined range, the liquefied
gas can be gasified by means of an Open-Rack-type liquefiedgas
vaporizer 1 having a simple configuration and high
operability even when the hull rolls due to waves and wind.
Therefore, as compared with the case of installing a
cascading-type or a water (involving steam as its vapor)-
heating-type liquefied-gas vaporizer, which has conventionally
been employed for offshore use, it is possible to considerably
lower the cost of the ship.
{0040}
Note that the present invention is not limited only to
the configuration of the above-described embodiment, and it is
possible to incorporate appropriate alterations and
improvements within a range that does not depart from the
scope of the present invention, and embodiments in which such
alterations and improvements are incorporated are also
encompassed by the range claimed by the present invention.
For example, although the above-described embodiment has
been described in terms of a liquefied-gas vaporizer to be
installed in a ship, such as a liquefied-gas transport ship or
the like, it may be a liquefied-gas vaporizer to be installed
in an offshore floating unit, such as an FSRU, an FPSO, or the
like.
Furthermore, the numbers of the heat exchange panels 6
and the troughs 10A and 10B may differ from those in this
22
embodiment, and, additionally, the heating-medium fluid need
not only be seawater but may also be lake water, river water,
or the like.
{Reference Signs List}
{0041}
I liquefied-gas vaporizer
5 heat transfer pipe
6 heat exchange panel
10A, 10B trough
II bottom plate
14 partitioning plate
18 overflow opening
18a heat-exchange-panel edge portion (edge portion that faces
heat exchange panel)
18b heat-exchange-panel opposite edge portion (edge portion
that does not face heat exchange panel)
20 baffle plate
21 water supply section
23 distribution water nozzle
23a water supply port
24 water supply nozzle
HA height of trough in vertical direction at edge portion that
faces heat exchange panel
HB height of trough in vertical direction at a edge portion
that does not face heat exchange panel
23
LI distance from trough bottom plate to heat-exchange-panel
edge portion
L2 distance from trough bottom plate to heat-exchange-panel
opposite edge portion
C horizontal distance between heat-exchange-panel edge portion
and heat-exchange-panel opposite edge portion
W seawater (heating-medium fluid)
WL water line
9 maximum tilt angle of entire liquefied-gas vaporizer
CLAIMS:
1. A liquefied-gas vaporizer comprising:
a heat exchange panel that gasifies liquefied gas at an interior thereof by means of heat exchange; and a
trough disposed adjacent to the heat exchange panel, wherein the liquefied gas is subjected to the
heat exchange by making a heating-medium fluid overflow from an overflow opening of the trough
and by making the heating- medium fluid flow on a surface of the heat exchange panel, and wherein
the liquefied-gas vaporizer has a configuration in which a vertical height from a bottom plate to an
edge portion of the trough that does not face the heat exchange panel is set so as to be greater than a
vertical height from the bottom plate to an edge portion of the trough that faces the heat exchange panel,
wherein an interior of the trough is partitioned into a plurality of water supply sections that are horizontally
arranged in a longitudinal direction of the trough, the liquefied-gas vaporizer further comprising a
distribution water nozzle for evenly distributing the heating- medium fluid to the plurality of water supply
sections.
2. The liquefied-gas vaporizer according to Claim 1, wherein when a horizontal distance between the
edge portion that faces the heat exchange panel and the edge portion that does not face the heat
exchange panel is C, when a maximum tilt angle of the liquefied-gas vaporizer in the C- direction is ©,
when a distance from the bottom plate to the edge portion that faces the heat exchange panel is LI,
and when a distance from the bottom plate to the edge portion that does not face the heat exchange panel is
L2, LI and L2 are set so that the following expression is achieved:
L2-L1> OtanO.
3. The liquefied-gas vaporizer according to Claim 2, wherein the distribution water nozzle has a pipe-shape
that passes through the plurality of water supply sections so as to extend in the longitudinal direction of the
trough, and that has water supply ports that respectively open at interiors of the individual water supply
sections.
4. The liquefied-gas vaporizer according to any one of Claims 1 to 3, wherein the two overflow
openings for individually making the heating-medium fluid flow on each of the heat exchange panels
that face each other are disposed adjacent to each other in the trough installed between the two heat
exchange panels that face each other, a partitioning plate that partitions the two overflow openings
is provided, and a top edge portion of the partitioning plate is the edge portion that does not face the heat
exchange panel and that is shared by the two overflow openings.
5. A ship equipped with a liquefied-gas vaporizer configured according to any one of Claims 1, 2, 3 and 4.